Aerodynamic fragmentation of bulk liquid into small droplets is an essential spray process that occurs in a variety of combustion systems. The aerodynamic breakup of non-Newtonian fluids, such as aerospace propellants, bio-fuels, fire-fighting liquids, thermal barrier coatings, water-gel explosives, paints, etc, is involved in many important applications. Non-Newtonian fluids differ from Newtonian fluids in that they do not exhibit a linear shear stress-strain rate relationship. They are employed when the liquid is desirable to have a low viscosity during spray formation (high strain rate) and a higher viscosity when on a target (low strain rate). This useful rheological behavior leads to a significantly different breakup mechanism of non-Newtonian fluids compared to that of Newtonian liquids. Unfortunately, there are limited experimental studies on the aerodynamic breakup of non-Newtonian drops. This is probably due to the difficulty in measuring fragments of complex morphologies. Digital in-line holography (DIH) provides simultaneous measurements of the particle size and position with unique access to three-dimensional (3D) information. Previous applications have demonstrated its applicability to arbitrary-shape particles, capability of extracting 3D morphologies, and effectiveness in characterizing the aerodynamic breakup of Newtonian drops. In the present study, the aerodynamic breakup of non-Newtonian drops is characterized using DIH. The measured characteristics including breakup morphologies, fragment/droplet size distribution and velocity distributions, demonstrate the effectiveness of DIH as a diagnostic tool for non-Newtonian fluids.
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ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels
August 3–7, 2014
Chicago, Illinois, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4626-1
PROCEEDINGS PAPER
Measurement of Aerodynamic Breakup of Non-Newtonian Drops by Digital In-Line Holography Available to Purchase
Neil S. Rodrigues,
Neil S. Rodrigues
Purdue University, West Lafayette, IN
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Paul E. Sojka,
Paul E. Sojka
Purdue University, West Lafayette, IN
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Jun Chen
Jun Chen
Purdue University, West Lafayette, IN
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Jian Gao
Purdue University, West Lafayette, IN
Neil S. Rodrigues
Purdue University, West Lafayette, IN
Paul E. Sojka
Purdue University, West Lafayette, IN
Jun Chen
Purdue University, West Lafayette, IN
Paper No:
FEDSM2014-22039, V002T11A009; 6 pages
Published Online:
December 22, 2014
Citation
Gao, J, Rodrigues, NS, Sojka, PE, & Chen, J. "Measurement of Aerodynamic Breakup of Non-Newtonian Drops by Digital In-Line Holography." Proceedings of the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 2, Fora: Cavitation and Multiphase Flow; Fluid Measurements and Instrumentation; Microfluidics; Multiphase Flows: Work in Progress; Fluid-Particle Interactions in Turbulence. Chicago, Illinois, USA. August 3–7, 2014. V002T11A009. ASME. https://doi.org/10.1115/FEDSM2014-22039
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